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 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 * contributors may be used to endorse or promote products derived from
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#pragma once

#include <cute/config.hpp>

#include <cute/util/type_traits.hpp>
#include <cute/numeric/integral_constant.hpp>

//
// CUDA compatible print and printf
//

namespace cute
{

CUTE_HOST_DEVICE
int
num_digits(int x)
{
  return (x < 10 ? 1 :
          (x < 100 ? 2 :
           (x < 1000 ? 3 :
            (x < 10000 ? 4 :
             (x < 100000 ? 5 :
              (x < 1000000 ? 6 :
               (x < 10000000 ? 7 :
                (x < 100000000 ? 8 :
                 (x < 1000000000 ? 9 :
                  10)))))))));
}

template <class T>
struct format_and_size {
  using type = T;
  char const* format;
  int digits;
};

CUTE_HOST_DEVICE
format_and_size<int>
get_format(bool) {
  return {"%*d", 3};
}

CUTE_HOST_DEVICE
format_and_size<int32_t>
get_format(int32_t) {
  return {"%*d", 5};
}

CUTE_HOST_DEVICE
format_and_size<uint32_t>
get_format(uint32_t) {
  return {"%*d", 5};
}

CUTE_HOST_DEVICE
format_and_size<int64_t>
get_format(int64_t) {
  return {"%*d", 5};
}

CUTE_HOST_DEVICE
format_and_size<uint64_t>
get_format(uint64_t) {
  return {"%*d", 5};
}

CUTE_HOST_DEVICE
format_and_size<float>
get_format(half_t) {
  return {"%*.2f", 8};
}

CUTE_HOST_DEVICE
format_and_size<float>
get_format(float) {
  return {"%*.2e", 10};
}

CUTE_HOST_DEVICE
format_and_size<double>
get_format(double) {
  return {"%*.3e", 11};
}

//
// print dispatcher
//

CUTE_HOST_DEVICE
void
print(char const& c) {
  printf("%c", c);
}

template <class T,
          __CUTE_REQUIRES(CUTE_STL_NAMESPACE::is_integral<T>::value)>
CUTE_HOST_DEVICE
void
print(T const& a) {
  printf("%d", int(a));
}

template <class... T>
CUTE_HOST_DEVICE
void
print(char const* format, T const&... t) {
  printf(format, t...);
}

} // end namespace cute
